机械合金化方法制备Al_xCoCrCu_(0.5)FeNi高熵合金组织结构和性能研究  

Microstructure and Properties of Al_xCoCrCu_(0.5)FeNi High-entropy Alloy Prepared by Mechanical Alloying

作　　者：袁尹明月 彭坤[1] 王海鹏[1] 汤灵[1] 彭欣[1] 

机构地区：[1]湖南大学材料科学与工程学院,长沙410082

出　　处：《材料导报》2016年第16期69-73,共5页Materials Reports

摘　　要：采用机械合金化和真空热压烧结方法制备了Al_xCoCrCu_(0.5)FeNi高熵合金,研究Al含量对合金系的晶体结构、显微组织、硬度、压缩性能以及摩擦磨损行为的影响。球磨60h和真空热压烧结后的晶体结构均为FCC和BCC双相结构,但相对含量发生变化。Al含量的增加使合金塑性降低,硬度和强度增大,低Al含量的Al_0、Al_(0.5)合金塑性好,强度低,压缩量高达30%和25.6%;高Al含量的Al_(1.0)、Al_(1.5)合金塑性较差,强度高,压缩强度达到1855MPa和2083 MPa,原子半径大的Al含量增加造成严重的晶格畸变,使固溶强化效应增加是合金硬度和强度升高的主要原因。随着Al含量的增加,合金的断裂方式由韧性断裂向脆性断裂转变。合金的耐磨性与硬度呈正相关关系,Al_0、Al_(0.5)、Al_(1.0)的磨损机制为黏着磨损与磨粒磨损,Al_(1.5)合金则为磨粒磨损。The AlxCoCrCu（0.5）FeNi high-entropy alloy was prepared by mechanical alloying（MA）and vacuum hot pressing sintering（HP）.The effects of Al content on the crystal structure,microstructure,hardness,compressive properties and wear behavior of the AlxCoCrCu（0.5）FeNi high-entropy alloy were studied in detail.The crystal structure after 60 hball milling and vacuum hot pressing sintering did not change with the increase of Al content,with both FCC and BCC phase coexistence structure,but the relative content changed.The increase of the content of Al element leaded to the plasticity reduction but the increase of hardness and strength,Al0 and Al（0.5）had good plasticity,low strength,the deformation amount reached 30% and 25.6%;while Al（1.0）and Al（1.5）had low plasticity,good strength,the compressive strength reached 1855 MPa and 2083 MPa.The increase of the Al content with large atomic radius caused serious lattice distortion.The increase of solid solution strengthening effect was the main reason for the enhancement of the hardness and strength of the alloy.With the increase of Al content,the fracture mode of the alloy was gradually changed from ductile fracture to brittle fracture.The wear resistance of alloys was proportional to their hardness,the wear mechanism of Al0,Al（0.5）,Al（1.0）were adhesive wear and abrasive wear,and Al（1.5）was abrasive wear.

关 键 词：高熵合金 机械合金化 真空热压烧结 压缩性能 摩擦磨损行为 

分 类 号：TB321[一般工业技术—材料科学与工程]